用鼠标拖动物体的一段代码

这是一段拖动物体的代码，比较简洁明了，对了解unity3d脚本概念有些帮助！在此加上注释分享！

varmouseOverColor = Color.blue;//声明变量为蓝色

privatevaroriginalColor : Color;//声明变量存储本来颜色

functionStart () {

   originalColor = renderer.sharedMaterial.color;//开始时得到物体本来着色

}

functionOnMouseEnter () {

   renderer.material.color = mouseOverColor;//当鼠标滑过时改变物体颜色为蓝色

}

functionOnMouseExit () {

   renderer.material.color = originalColor;//当鼠标滑出时恢复物体本来颜色

}

functionOnMouseDown () {

   varscreenSpace = Camera.main.WorldToScreenPoint(transform.position);//三维物体坐标转屏幕坐标

   //将鼠标屏幕坐标转为三维坐标，再算出物体位置与鼠标之间的距离

   varoffset = transform.position - Camera.main.ScreenToWorldPoint(Vector3(Input.mousePosition.x, Input.mousePosition.y, screenSpace.z));

   print("down");

   while(Input.GetMouseButton(0))

   {

       //print("button0");

       varcurScreenSpace = Vector3(Input.mousePosition.x, Input.mousePosition.y, screenSpace.z);

       varcurPosition = Camera.main.ScreenToWorldPoint(curScreenSpace) + offset;

       transform.position = curPosition;

       yield;//这个很重要，循环执行

   }

}